I got a thought what if the student is female and is secretly hiding her brother in her dorm room because he has no place to go? They have to wait until the campus is closed down so that they can privately celebrate the holidays together, while they are celebrating they get caught.

This is a good concept. I once stayed in the dorm over spring break when my plans fell through at the last minute. There were only about 20 of us in the entire dorm, out of around 400 normally. We had to register before hand, or we would not have been allowed in. The staff was reduced to a minimum, there was no food service, and for the most part it was a big empty building. Tons of story potential here.